JP2008018045A - Mattress - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mattress for self-support for persons requiring the care of a mild or intermediate degree, which is excellent in a body pressure dispersing performance, is excellent in the easiness of rising on a bed, the easiness of moving and the stable feeling of an upright sitting position, etc., while having a high bedsore preventing effect, and especially has functionality for the purpose of self-support for the persons requiring the care. <P>SOLUTION: The mattress with the body pressure dispersing performance is composed of at least three layers of a surface layer 1(A), intermediate layers 2 and 3(B) and a back surface layer 4(C) formed by laminating a foamed mat material. The intermediate layer (B) is structured such that a hard member 3(B1) is disposed on at least a part of the peripheral edge part in the short side direction of the mattress and a soft member 2(B2) is disposed at the center part in the width direction of the mattress. While the hardness with the respective layers has the hardness relation of (B1)>(C)>(A and/or B2), the contact surface with the soft member 2(B2) of the hard member 3(B1) is inclined toward the center of the back surface layer 4(C). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mattress, and in particular, has a body pressure dispersion performance, and the hardness of the peripheral portion of the mattress is larger than the hardness of the central portion thereof. For mattresses.

Elderly people who need to take the same posture on the bed for a long time or care recipients may develop bed slipping due to large pressure on the body part. Various developments have been made.
As the bed slip prevention mattress, for example, a mattress (see, for example, Patent Document 1) in which a large number of protrusions are formed on the upper surface to improve body pressure dispersion performance and air permeability is disclosed. In order to further enhance, a mattress having a low-resilience polyurethane disposed on the top of the protrusion (see, for example, Patent Document 2), and a pressure receiving optimization portion made of a silicone gel material is sandwiched between a plurality of foamed mat materials having different hardnesses. A pressure ulcer prevention mat (for example, refer to Patent Document 3) is disclosed.

However, in the case of mild care recipients who get up and get out of bed on their own or with the assistance of a caregiver, these mattresses are deeply submerged compared to conventional mattresses because they focus on body pressure distribution. Due to the tendency, the entire mat is soft, and it is said that the posture changes from the supine position to the side position, which is often seen in mild care recipients and elderly people, standing on one side of the elbow, extending the elbow to the mat surface and becoming a sitting position In the process of getting up and getting out of bed, it is difficult to maintain balance when moving to the sitting position by standing on one side of the arm, extending the hand to the mat surface, and muscle strength is also required, so mild care recipients with poor muscle strength and For those who need assistance, elderly people, etc., it is often difficult to get up and move on the top. In addition, instability and bottoming in the sitting position at the end sitting on the edge of the bed has occurred, and the sense of stability is not necessarily good, and the person requiring mild care and support is required. And it was not suitable for the independence of the elderly. In addition, air mats and stationary urethane foam mattresses are used in the market to prevent bed slipping for bedridden care recipients, but they are effective in preventing bed slipping, but are independent for mild care recipients. There were no functional products aimed at the purpose.
In recent years, the burden on caregivers (especially at-home care) has increased due to the shift to bedridden status due to a decline in the independence of care recipients, and the need for caregiver assistance at all times, and QOL of caregivers and caregivers has increased. It has been pointed out that the quality of life will be reduced, and supportive support and elderly people who do not need nursing care will also provide independence support for mild care recipients from the perspective of preventing transition to a need for nursing care. It has been desired to produce a mattress having the intended functionality.

In order to solve such problems, the mattress is made of a foamed resin and has a high body pressure dispersion performance in which a plurality of protrusions are continuously erected on the upper surface. There is disclosed a mattress (see, for example, Patent Document 4) in which a portion whose length is larger than the central portion is formed.
Further, in order to provide a mattress that is comfortable to sleep and is easy for a user to rise, in the mattress composed of a plate-shaped cushion material and a cover that covers the cushion material, the cushion material is substantially formed of a polyethylene foam. And a mattress characterized in that the peripheral edge of the cushion material is structurally harder than the central part (see, for example, Patent Document 5), and is suitable for both heavy and light persons. Softness is obtained, and it is difficult to cause pressure ulcers (bed slippage) even when sleeping for a long time. Furthermore, even if a caregiver sits on the edge of the mattress frequently, the resilience is not impaired, and it is used for a long time. In order to provide a mattress for a bed that can be made, one of the front and back surfaces of the mattress main body is a low-hardness side foam layer, and the other is a high-hardness side foam layer. Made from those stacked bed mattresses, characterized in that available with the back to front (e.g., see Patent Document 6.) Is disclosed.

However, although the mattress of Patent Document 4 uses one type of foamed resin body and changes the shape and size of the protrusions, the hardness of the foamed resin constituting the mattress differs between the peripheral part and the central part. In addition, there is room for improvement in that it feels uncomfortable due to unevenness in the sitting position or with the hand in hand, and also satisfies body pressure dispersibility, ease of rising, and stability of the sitting position. However, there is also a problem that the design of the concavo-convex pattern is complicated and mass production efficiency in machining is not necessarily good.
In addition, the mattress of the above-mentioned Patent Document 5 is a cushioning material in which the peripheral portion is formed of a hard cushion material and the central portion is formed of a soft cushion material, and the peripheral portion and the central portion are both hard cushion materials. It is composed of a laminated body in which the formed B layer is arranged, and the peripheral portion of the cushion material is structurally harder than the central portion, and is a structure that easily rises, but the bed end portion and the central portion There is a problem that there is a hardness gap, and the sitting position stability at the end of the mattress is not sufficient, and further, the mattress of Patent Document 6 described above is surrounded by the elastic frame body of the frame-like edge portion of the side surface of the mattress body. Although it has a characteristic and is easy to get up, there is a difference in hardness between the bed end and the center (hereinafter referred to as a hardness gap in this specification). Kicking loci stability there is a problem that not enough. In addition, the mattresses of Patent Document 4 and Patent Document 6 are structurally considered to support raising the back and knees (hereinafter referred to as gudge) when used in a special bed. It has not been able to follow the complicated gudge bottom floor shape of the special sleeper bed in recent years.
In particular, if there is a hardness gap in the mattress, when the mattress surface is covered with a cover, the hard and soft parts cannot be discerned from the mattress surface. When stepping on, the arm sinks into the soft side, and the arm that protrudes from the mattress loses its balance and may roll over on the bed, resulting in injury, and the user may take an end-sitting position deep in the center of the mattress. If the hardness gap is large, the balance may be lost backwards, falling backwards, and touching the fence attached to the bed may cause injury. ing.
JP 2000-093263 A JP 2000-152854 A JP 2002-0778757 A JP 2004-166925 A JP 2005-152232 A JP 2002-223901 A

  In view of the above-mentioned problems, the object of the present invention is excellent in body pressure dispersion performance, has a high floor slip prevention effect, and has a high rigidity in the mattress peripheral edge, but the boundary between the mattress central part and the peripheral part. Easier to get up on the bed, ease of movement, and a sense of stability in the end sitting position, etc. To provide a mattress for independence support for light and moderate care recipients, with the aim of providing a sense of security for users who are good, especially with the aim of providing independence support for care recipients .

  As a result of intensive investigations to solve the above problems, the present inventors have laminated foam mat materials having different hardnesses to give the mattress a function of dispersing body pressure, and have an appropriate hardness difference between the central portion and the peripheral portion. By configuring, in particular, for the intermediate layer of the laminate made of foamed mat material, a hard member is incorporated in at least a part of the peripheral portion of the mattress, and the structure is formed to be larger than the hardness of the center portion of the mattress, and By having at least one inclined surface on the surface of the hard member, that is, selecting and applying the optimal hard member, searching for and applying the optimal shape of the hard member, the result is a body pressure dispersion performance. It is easy to get up by making the hardness gap between the center of the mattress and the peripheral part extremely small, while having an excellent and high floor slip prevention effect. Found that loci stability is good in, based on their findings, the present invention has been completed.

That is, according to the first invention of the present invention, body pressure dispersion performance comprising at least three layers of a surface layer (A), an intermediate layer (B) and a back layer (C) formed by laminating foam mat materials is provided. The intermediate layer (B) has a hard member (B1) disposed on at least one of the peripheral portions in the short side direction of the mattress and a soft member (B2) disposed in the center portion in the width direction of the mattress. The hard member (B1) has a contact surface with the soft member (B2) while the hardness of each layer has a hardness relationship of (B1)>(C)> (A and / or B2). A mattress is provided that is inclined toward the center of the layer (C).
According to the second invention of the present invention, in the first invention, the hard member (B1) has a hardness measured in accordance with JIS K6401 “soft polyurethane foam for load bearing” of 250 to 440 N, A mattress is provided in which a cross-sectional inclination angle of the contact surface is 25 to 50 °.
Furthermore, according to the third invention of the present invention, in the first or second invention, the hardness of the surface layer (A) measured according to JIS K6401 “soft polyurethane foam for load bearing” is 70 to 130 N. There is provided a mattress characterized in that the soft member (B2) has a hardness of 90 to 140 N and the back surface layer (C) has a hardness of 150 to 210 N.

According to a fourth invention of the present invention, in any one of the first to third inventions, the surface layer (A) has a thickness of 15 to 30 mm, and the intermediate layer (B) has a thickness of 25 to 40 mm, And the mattress characterized by the thickness of a back surface layer (C) being 35-45 mm.
According to the fifth invention of the present invention, in any one of the first to fourth inventions, the hardness of the center portion of the mattress measured according to JIS K6401 “soft polyurethane foam for load bearing” is 85 to 85. A mattress is provided that is 95N, and the hardness of the periphery of the mattress is 150 to 170N, and gradually increases with respect to the hardness of the central portion.
Furthermore, according to the sixth invention of the present invention, in any one of the first to fifth inventions, the hard member (B1) starts the contact surface with the soft member (B2) from the end on the long side of the mattress. A mattress is provided, characterized in that the distance to the position is incorporated with a width of 150-200 mm.

According to the seventh aspect of the present invention, in any one of the first to sixth aspects, the outer side of the back surface layer (C) and / or the short side direction of the front surface layer side or the back surface layer side of the hard member (B1). A mattress having a plurality of grooves is provided.
According to an eighth aspect of the present invention, there is provided the mattress according to any one of the first to seventh aspects, wherein the foamed mat material is polyurethane foam.
Furthermore, according to the ninth aspect of the present invention, there is provided the mattress according to any one of the first to eighth aspects, further comprising a gel sheet laminated on at least one surface of the intermediate layer (B). Is done.

The mattress of the present invention is a mattress having a body pressure dispersion performance comprising at least three layers of a surface layer (A), an intermediate layer (B), and a back layer (C) formed by laminating foam mat materials. The layer (B) has a structure in which a hard member (B1) is arranged on at least one of the peripheral portions in the short side direction of the mattress and a soft member (B2) is arranged in the center portion in the width direction of the mattress. Has a hardness relationship of (B1)>(C)> (A and / or B2), the hard member (B1) has the contact surface with the soft member (B2) at the center of the back surface layer (C). The hardness gap is extremely small by gradually increasing the hardness of the joint boundary with the mattress center toward the periphery while ensuring high rigidity at the periphery of the mattress. As a result, excellent body pressure dispersion performance While having a high bedsores prevention effect, and an effect that excellent loci stability in bed end in structure easy standing up.
In addition, the mattress of the present invention preferably has an effect that, by laminating a gel sheet on the intermediate layer, excessive sinking of the lower back is suppressed and the body pressure dispersion performance is excellent for a heavy user.
Furthermore, the mattress of the present invention preferably has a plurality of grooves in the short side direction such as the outer side of the back layer (C), so that the periphery of the mattress has high rigidity due to the effect of the hard member (B1). However, there is also an effect that the followability is excellent with respect to the complicated movement of the bed floor during the special bed bed gag.

The mattress of the present invention is a mattress having a body pressure dispersion performance comprising at least three layers of a surface layer (A), an intermediate layer (B), and a back layer (C) formed by laminating foam mat materials. The layer (B) includes a hard member (B1) disposed on at least one of the peripheral portions in the short side direction of the mattress (in the present specification, synonymous with the width direction), and a soft member at the center of the mattress in the width direction. The hard member (B1) has a structure in which (B2) is arranged, and the hardness of each layer has a hardness relationship of (B1)>(C)> (A and / or B2), and the hard member (B1) and the soft member (B2) The contact surface is inclined toward the center of the back surface layer (C).
The hardness of the intermediate layer (B) and each layer is (B1)>(C)> (A and / or B2). The hardness of the surface layer (A) and the soft member (B2) of the intermediate layer is Either one may be larger or the same, the back layer (C) is harder than the surface layer (A) and the soft member (B2), and the hard member (B1) is harder than the back layer (C). When this hardness relationship is established, the contact surface between (B1) and (B2) has a hardness gradient structure to eliminate the hardness gap, and is excellent in body pressure dispersion performance and high floor slip prevention While having the effect, by further reducing the hardness gap between the center portion and the peripheral portion of the mattress, it is easy to get up and the sitting stability at the end of the bed becomes good.
Details will be described below.

An embodiment of the mattress of the present invention will be specifically described with reference to the drawings. FIG. 1 is a schematic cross-sectional view illustrating a layer structure of a mattress as a preferred embodiment of the present invention.
In FIG. 1, the mattress includes a foam mat material 1 of the surface layer (A) constituting the mattress, and a foam mat material 2 as the soft member (B2) at the center of the mattress as the intermediate layer (B) and the periphery of the mattress. It is comprised by the 3 layer laminated body of the foam mat material 3 as a hard member (B1) integrated in a part, and the foam mat material 4 of a back surface layer (C).

1. Middle layer (B)
In the present invention, the intermediate layer (B) is characterized in that the intermediate layer (B) incorporates a hard member (B1) into at least a part of the periphery of the mattress, and the periphery of the mattress is higher than the hardness of the center of the mattress. The hard member (B1) is structured such that the contact surface with the soft member (B2) is inclined toward the center of the back surface layer (C). It is what.
Due to the above-described features, the mattress of the present invention has an effect of being excellent in body pressure dispersion performance, having a high floor slip prevention effect, and having a structure that is easy to get up and excellent in sitting position stability at the end of the bed.
The hardness of the hard member is preferably 250 to 440 N as measured by 6.4 K method of JIS K6400-2 according to JIS K6401 “Soft polyurethane foam for load bearing”. If the hardness is less than 250N, the stability of the sitting position is not exhibited. On the other hand, if the hardness exceeds 440N, it is necessary for gag following ability even if the thickness is adjusted or the groove is formed on the density and the surface. This hinders the flexibility and comfort of the end sitting position.
Moreover, it is preferable that the hardness of the soft member (B2) which is a foam mat material in the center part of the mattress of the intermediate layer (B) is 90 to 140N. If it is less than 90 N, a problem of bottoming occurs, whereas if it exceeds 140 N, sufficient body pressure dispersibility cannot be obtained.

In the present invention, the peripheral hard member (B1) has an inclined surface in which the cross-sectional shape connected to the soft member (B2), which is the foam mat material in the central portion, is inclined toward the center of the back surface layer (C). By having the inclined surface, a hardness gradient gradually increasing structure is formed on the boundary surface, that is, the contact surface between the hard member (B1) and the soft member (B2), so the hardness gap is eliminated and the bed end sitting position stability is improved. It will be excellent. The cross-sectional inclination angle of the inclined surface is preferably 25 to 50 °, and more preferably 30 to 45 °. When the cross-sectional inclination angle is more than 50 °, a sufficient hardness gradient increasing action cannot be obtained, and a hardness gap that can be experienced is generated. On the other hand, when the cross-sectional inclination angle is less than 25 °, the inclination is too small and the high hardness range occupying the bed width increases, and sufficient body pressure dispersion performance cannot be obtained.
An example of variations in cross-sectional shape of the hard member (B1) is shown in FIG. The cross-sectional shape is inclined toward the center of the back surface layer (C). As a result, the hardness gap at the boundary surface between the hard member (B1) and the soft member (B2) is eliminated, and the hardness of the center portion is reduced. As long as the slope gradually increases, there is no particular limitation.

The hard member (B1) is preferably incorporated with a width of 150 to 200 mm from the end of the mattress long side to the starting position of the contact surface with the inclined surface, that is, the soft member (B2). When the distance to the starting position of the inclined surface is less than 150 mm, it is difficult to ensure stability when the palm is attached. On the other hand, when it exceeds 200 mm, the occupation ratio of the rigid portion is high with respect to the bed width, and the sleeping portion Can not secure enough area.
Furthermore, the optimum range of the thickness of the intermediate layer (B) varies depending on the thickness of the entire mattress. However, the trend in demand for specifications of current mattresses for nursing care is a trend toward lighter and thinner thicknesses, and those skilled in the art are also increasing the thickness to 90 mm. Therefore, when the thickness of the mattress of the present invention is also set to 90 mm, it is preferably about 25 to 40 mm, and more preferably 25 to 30 mm. Outside this range, even when the thickness balance between the front surface layer (A) and the back surface layer (C) is adjusted, optimal body pressure dispersibility, bottoming prevention, end-sitting stability and sitting comfort cannot be obtained. For example, if the surface layer (A) is designed to be thin, the hardness gap is remarkably easily felt at the joint portion between the soft member (B2) and the hard member (B1) at the center of the intermediate layer (B). ) Becomes thick (equivalent to a design where the back layer is thin), there is a problem with bottoming and edge sitting stability.

The hard member (B1) at the periphery of the intermediate layer (B) is not particularly limited as long as it has a hardness of 250 to 440N, but is preferably a semi-rigid polyurethane foam. The semi-rigid polyurethane as used herein refers to those having intermediate hardness between soft polyurethane and rigid polyurethane generally classified by those skilled in the art of manufacturing and selling polyurethane foam. In the semi-rigid polyurethane foam, the density is preferably 40 kg / m ³ or more from the viewpoint of the strength durability due to the compressive strain, as long as it does not deviate from the mattress requirement in the hardness range of the hard member (B1). Selected.
Further, the soft member (B2), which is a foamed mat material at the center, is not particularly limited as long as it has a hardness of 90 to 140 N. However, a soft resin foam is preferable, and foamed polyurethane, foamed polyolefin, and foamed silicone are preferable. In particular, it is preferable that the polyurethane foam is a soft (low hardness) polyurethane foam. In the polyurethane foam, the density is preferably 22 kg / m ³ or more from the viewpoint of strength and durability due to compressive strain. As long as it does not deviate from the mattress requirement in the hardness range of (B2), it is appropriately selected.

2. Surface layer (A) and back layer (C)
In the mattress of the present invention, the hardness of the foam mat material of the surface layer (A) is preferably 70 to 130N. When the hardness of the surface layer (A) is less than 70, good body pressure dispersibility can be obtained, but a problem of bottoming in the sitting position at the time of gag occurs. On the other hand, when it exceeds 130 N, sufficient body pressure dispersion performance cannot be obtained. Further, the foamed mat material of the surface layer (A) is not particularly limited as long as the hardness is 70 to 130N, but a soft resin foam is preferable, foamed polyurethane, foamed polyolefin, and foamed silicone are preferable. Polyurethane, that is, soft (low hardness) polyurethane foam is preferred. In the polyurethane foam, the density is preferably 22 kg / m ³ or more from the viewpoint of strength durability due to compression strain, and is appropriately selected as long as it does not deviate from the mattress requirement in the hardness range of the surface layer (A).
Furthermore, the thickness of the surface layer (A) is preferably about 15 to 30 mm when the thickness of the entire mattress is about 90 mm. If the thickness is less than 15 mm, the hardness gap at the portion where the hard member (B1) is incorporated becomes remarkably easy to feel, while if it exceeds 30 mm, problems such as bottoming and end-sitting stability occur.

The hardness of the foam mat material of the back layer (C) is preferably 150 to 210N. When the hardness of the back surface layer (C) is less than 150, a problem of bottoming in the sitting position at the time of gag occurs. On the other hand, in the case of more than 210N, many grooving processes are necessary to ensure gag follow-up performance, which is not suitable in terms of mass productivity and cost. The foamed mat material for the back layer (C) is not particularly limited as long as the hardness is 150 to 210 N, but is preferably a soft (high hardness) polyurethane foam. In the polyurethane foam, the density is preferably 30 kg / m ³ or more from the viewpoint of strength durability due to compressive strain, and is appropriately selected as long as it does not deviate from the mattress requirement in the hardness range of the back layer (C).
Furthermore, the thickness of the back surface layer (C) is preferably about 35 to 45 mm when the thickness of the entire mattress is about 90 mm. When the thickness of the back layer (C) is less than 35 mm, in addition to the bottom and the mechanical durability of the mattress when the floor of the special bed is partially in line contact like a mesh structure On the other hand, if it exceeds 45 mm, sufficient body pressure dispersibility cannot be obtained.

3. Mattress In the present invention, the foam hardness of each layer is as described above, but the hardness of the laminate constituting the mattress is in accordance with JIS K6401 “6. It is preferable that the hardness of the center part of the mattress measured by the 4D method is 85 to 95 N, and the hardness of the peripheral part of the mattress is 150 to 170 N. In addition, it is an essential requirement that the hardness of the peripheral portion of the mattress is gradually increased with respect to the hardness of the central portion. If the hardness of the center portion of the mattress is in the range of 85 to 95N, the body will have sufficient body pressure dispersion performance. If the hardness of the peripheral portion of the mattress is in the range of 150 to 170N, it will be moderate. Sitting position stability and gag following ability can be realized.

  Moreover, it is preferable to have a some groove | channel (or slit) in the short side direction of the outer side of a back surface layer (C) for the mattress followability of a mattress. The pitch and depth can be appropriately adjusted according to the hardness and thickness of the foamed mat material used for the back layer (C). For example, when the hardness of the foam mat material of the back layer (C) is 150 to 210 N and the thickness is 30 mm, the groove width is 3 to 5 mm, the groove depth is 65% or less of the layer thickness, and the pitch is preferably 40 to 80 mm. More preferably, it is 55-65 mm. Further, the groove interval does not need to be constant and can be set as appropriate. However, the waist portion at the supine position and the central portion at the sitting position at the gudge are preferably 55 mm or more from the viewpoint of bottoming. Moreover, it is preferable to give a groove | channel (or slit) to the whole surface from the point of the shape following property of a gudge bed. Furthermore, it is preferable to appropriately process, for example, a circular groove having a diameter of about 5 mm at the bottom of the groove to prevent it from being avoided by bending tensile stress.

  Furthermore, it is preferable that the hard member (B1) of the intermediate layer (B) also has a plurality of grooves (or slits) for the mattress following ability of the mattress. Although it is possible to form grooves on both sides of the hard member, it is necessary to increase the thickness of the hard member because the apparent strength of the semi-rigid polyurethane foam used for the hard member is reduced, and as a result, the thickness of the entire mattress From the viewpoint of increasing the thickness and weight and processing cost, it is preferable to perform groove processing in the short side direction on the surface layer side of the hard member. For example, the groove depth is 60% or less of the hard member layer thickness, and the pitch is preferably in the range of R20 to 35, preferably 40 to 70 mm, more preferably 45 to 55 mm. If the pitch is less than 40 mm, the unevenness in the sitting position is noticeably noticeable, the apparent hardness of the sitting position is reduced, and the sitting stability is inferior. On the other hand, if it exceeds 70 mm, a problem arises in the follow-up performance.

The mattress of the present invention is a body pressure comprising at least a three-layer laminate of a surface layer (A), an intermediate layer (B), and a back layer (C) formed by laminating foam mat materials having different hardness over all or a part thereof. For example, a gel sheet can be further laminated between the intermediate layer (B) and at least one of the surface layer (A) and the back surface layer (C). Moreover, as a member which laminates | stacks a gel sheet, the intermediate | middle layer (B) hard member (B1) or soft member (B2), or both members may be sufficient.
The gel sheet is more preferably laminated between the surface layer (A) and the intermediate layer (B) from the viewpoint of suppressing excessive sinking of the user's lower back while maintaining good body pressure dispersion performance. preferable.
Moreover, you may laminate | stack the raw material which functions as a bottoming suppression member not only by a gel sheet but by the repulsion of the tension | tensile_strength applied to a mattress perpendicularly | vertically. As such a material, for example, a non-stretchable or stretchable mesh material can be laminated. More specifically, examples of the non-stretchable or stretched mesh material include a fabric, a nonwoven fabric, a three-dimensional fabric, a resin net, an elastomeric net, an elastomeric sheet, or a composite material thereof. By using a mesh-like material, the weight of the mattress can be reduced.

  When laminating the mattress of the present invention, the bonding method of each layer is not particularly limited, but the surface layer (A), the soft member (B2) of the intermediate layer (B), the back layer (C) and the intermediate layer (B) For example, a urethane-based or acrylic solvent-based and water-based known synthetic resin adhesive or pressure-sensitive adhesive film can be used for the contact surface with each layer of the hard member (B1).

  Moreover, each layer of the surface layer (A), the intermediate layer (B), and the back layer (C) may be formed by combining a plurality of foams as parts within the same hardness range. The surface of the foam may have a concavo-convex shape as long as it does not impair the characteristics of the mattress of the present invention in addition to a flat plate.

The present invention will be specifically described below by showing experimental data and examples for satisfying the setting conditions of the invention, but the present invention is not limited by these examples unless departing from the gist thereof. The test method is as follows.
(1) Hardness: Measured by 6.4 D method of JIS K6400-2 based on JIS K6401 “Soft polyurethane foam for load bearing”.
(2) Sacral pressure as body pressure dispersibility: The body pressure in the sacrum was measured using a cello made by Cape.
(3) Gage follow-up evaluation: The maximum erection was performed with a 3-motor drive bed, and the presence or absence of the mattress was visually evaluated with respect to the floor board when knees were raised. The evaluation criteria are as follows.
○: No mattress lift (good)
×: Mattress lifted (bad)
“With floating” was determined to be floating when a gap of 5 mm or more was generated on the back surface of the mattress from the bed floor.

(4) Evaluation with bottom: When 20 subjects with a standard body weight with a body weight of 45 to 70 kg BMI took a sitting position and felt a commercially available general-purpose ballpoint pen under the mat, it was evaluated that there was a bottom. The evaluation criteria are as follows.
○: No bottom (good)
×: With bottom (bad)

(5) Ease of getting up: Immediately after the movement of end-sitting position, supine position → side-down position → end-sitting position, with 10 men and women, a total of 20 persons, covering the stretchable cover so that the contents cannot be distinguished The sensitivity test was based on a method that requires the user to fill in the sensation, and the following three-stage evaluation was performed.
○: Easy to get up △: Slightly unstable ×: Unstable

(6) End-sitting stability: Sensitive test of 10 men and women, a total of 20 people who put in a stretchable cover so that the contents cannot be distinguished and enter the sense in the end-sitting position Then, the following three-stage judgment was performed.
○: I do not feel △: I can say neither ×: I feel clearly

(7) Hardness Gap Sensitivity Evaluation: A total of 20 people, 10 men and women, push the seam part vertically with their palms and enter whether they feel the hardness of the tapered part. Stage determination was performed.
○: I do not feel △: I can say neither ×: I feel clearly

(8) Comprehensive judgment evaluation As a judgment of comprehensive evaluation, a plurality of test results were ranked according to the following criteria.
◎: All test results are ○ (very good)
○: One △ is included in the test result, and x is absent (good)
Δ: Two or more Δs are included in the test result, and X is absent (slightly inferior)
X: There is at least one x in the test result (inferior)

[Selection condition 1: Experiments 1 to 14 Optimum conditions for mattress laminate structure]
The following experiment was conducted in order to find a mattress structure condition that is excellent in body pressure dispersion performance, has no bottom in the sitting position, and is suitable for gag following ability.
In a laminated mattress that does not incorporate a hard member (B1) having a length of 1910 mm, a width of 910 mm, and a thickness of 90 mm, a foam mat material for the surface layer (A) and a soft member (B2) at the center of the mattress of the intermediate layer (B) A foamed mat material and a foamed mat material of the back layer (C) are laminated using a urethane-based solvent adhesive with varying hardness, density (unit: kg / m ³ ) and thickness according to JIS K6400. A mattress was prepared.
Polyurethane foam was used as the foam material, and the thickness of each layer was a combination of 10 mm increments from 10 mm to 50 mm and a mattress thickness of 90 mm. Furthermore, since it was found in a preliminary test that the back surface layer (C) needs to be grooved in order to achieve both mechanical strength durability on the back surface of the mattress and gag followability, the back surface layer (C) has a depth of 20 mm, A slit having a width of 3 mm and a pitch of 60 mm was put in the entire width direction. The groove pattern is one of the patterns that have been found to be satisfactory as a result of various investigations on patterns that are difficult to bottom even when the bed floor is mesh-like.
Using the obtained mattress, measurement of hardness of each part, measurement of sacral pressure as body pressure dispersibility, evaluation of gag follow-up, evaluation of bottom, especially body pressure dispersibility and gag follow-up and center Comprehensive evaluation was performed based on the results of bottoming in the sitting position. A part of the results are shown in Table 1.

  From the results shown in Table 1, as the basic structure of the mattress, the hardness of each layer is 70 to 130N for the surface layer, 90 to 140N for the center of the intermediate layer (B), and 150 to 210N for the back layer (C). The hardness range was specified. Moreover, as a result of analyzing based on the results not described in Table 1, the optimum thickness of each layer is 15 to 30 mm for the surface layer (A), 25 to 40 mm for the intermediate layer (B), and the back surface. Layer (C) specified an optimum range of foam thickness of 35-45 mm.

[Selection condition 2: Experiments 15 to 23: Optimum conditions for material characteristics of hard member (B1)]
In order to find an optimum condition of the material characteristics of the hard member (B1) incorporated in the intermediate layer (B) in order to make it a mattress that is easy to get up and has excellent sitting position stability and suitable for gag following ability, the following experiment was conducted.
In the mattress constitution condition of Experiment 10 (OK) which showed excellent results in the examination of the selection condition 1, a semi-rigid polyurethane foam having a width of 150 mm from both ends of the mattress long side toward the center of the mattress and serving as a hard member (B1) Was prepared in the intermediate layer (B), and the end-sitting position stability, easiness of rising, and gag following ability due to the hardness and thickness of the hard member were evaluated.
In addition, the effect of the presence or absence of groove processing on the hard member was also examined. The groove depth was 50% of the thickness of the hard member layer, the pitch was 55 mm, the edge of the groove was chamfered with R25, and the groove tip was rounded with a diameter of 5 mm. The groove processing condition is one of the pattern variations that are good as a result of examination of the optimum design of the groove shape in consideration of the gag followability and the sitting comfort. Further, the groove processing on the semi-rigid polyurethane foam was performed only on the upper surface side. The results are shown in Table 2.

  From the results of Table 2, the optimum hardness of the hard member (B1) was specified to be in the range of 250N to 440N. Moreover, in addition to the adjustment of the hardness and thickness of a hard member, it discovered that gag | trackability followability and sitting position stability could be ensured by adding a groove process. However, at this stage, the hardness gap between the center portion and the peripheral portion of the mattress is large, and the subsidence at the time of applying a load on the joint surface of the hard member of the intermediate layer (B) and the foam material in the center portion is steep, The sitting stability of was not obtained.

[Selection condition 3: Experiments 24-28 Optimal shape condition of hard member (B1)]
Except for forming inclined surfaces with different inclination angles on the hard member, the material composition is the same as the mattress structure of Experiment 20, which has been evaluated well in the selection condition 2, and the inclination angle dependence on the hardness gap sensation and sitting position stability Sex was evaluated. The results are shown in Table 3.

  As a result of Table 3, it was specified that the optimum angle of the inclined surface of the hard member (B1) was in the range of 20 ° to 50 °.

Specific examples carried out based on the optimum conditions and range of the present invention found from the results of the selection conditions 1 to 3 will be shown, and the effects of the present invention will be described.
[Example 1]
Polyurethane foam with a hardness of 120 N and a thickness of 20 mm (PU foam: ER-1 (trade name) manufactured by INOAC) as a foam mat material for the surface layer (A) in a laminated mattress measuring 1910 mm long x 910 mm wide x 90 mm thick As a soft member (B2) of foamed mat material at the center of the mattress of the intermediate layer (B), a polyurethane foam having a hardness of 120 N and a thickness of 20 mm (PU foam: ER-1 (trade name) manufactured by INOAC) In addition, as the hard member (B1) of the intermediate layer (B), a polyurethane foam (PU foam: EMS (trade name) manufactured by INOAC) having a hardness of 400 N and a thickness of 30 mm is used, and the hard member (B1) and An inclined surface having an inclination angle of 45 ° is formed as a joint surface with the soft member (B2) toward the center of the back surface layer (C), and the back surface layer (C As of foam mat material, hardness 170N, with a thickness of 40mm polyurethane foam: using (PU foam INOAC Corporation ERG-H (trade name)), was laminated using a urethane-based adhesive.
Using the obtained mattress, hardness of each part, easiness of getting up, sitting position stability, measurement of sacral pressure as body pressure dispersibility, evaluation of gag follow-up, and evaluation of bottom were performed. The results are shown in Table 4.

[Example 2]
A mattress is produced under the same conditions as in Example 1 except that a gel sheet having a thickness of 3 mm is laminated between the surface layer and the intermediate layer in the middle range in which the long side of the mattress is equally divided into three and does not overlap with the hard member. did.
Using the obtained mattress, hardness of each part, easiness of getting up, sitting position stability, measurement of sacral pressure as body pressure dispersibility, evaluation of gag follow-up, and evaluation of bottom were performed. The results are shown in Table 4.

[Comparative Example 1]
A mattress was produced under the same conditions as in Example 1 except that the inclined surface of the hard member (B1) was not formed. Using the obtained mattress, hardness of each part, easiness of getting up, sitting position stability, measurement of sacral pressure as body pressure dispersibility, evaluation of gag follow-up, and evaluation of bottom were performed. The results are shown in Table 4.

[Comparative Example 2]
For commercially available single-layer mattresses with surface grooving, the hardness of each part, easiness to get up, sitting position stability, measurement of sacral pressure as body pressure dispersibility, evaluation of gag following, and evaluation of bottom went. The results are shown in Table 4.

As is clear from the comparison between Examples 1 and 2 and Comparative Examples 1 and 2 in Table 4, the mattress of the present invention has a body pressure dispersion performance necessary for a moderate / mild care recipient in the supine position. It can be seen from the measured values of the sacral region of the sacrum, and it can be seen from the sensitive evaluation of the ease of getting up that it is easy to get up on the mattress.
On the other hand, Comparative Example 1 has a hardness gap between the peripheral portion and the central portion, and it is difficult to get up. Further, Comparative Example 2 was inferior in the body pressure dispersion performance and had good sitting position stability, but was worried about sitting comfort due to the unevenness of the grooves formed on the surface.
Therefore, in Comparative Examples 1 and 2, the problem to be solved by the present invention is not solved, but in Examples 1 and 2 of the present invention, it is clear that the problem is solved.

The mattress of the present invention is a mattress having a body pressure dispersion performance comprising at least three layers of a surface layer (A), an intermediate layer (B), and a back layer (C) formed by laminating foam mat materials. The layer (B) has a structure in which a hard member (B1) is arranged on at least one of the peripheral portions in the short side direction of the mattress and a soft member (B2) is arranged in the center portion in the width direction of the mattress. Has a hardness relationship of (B1)>(C)> (A and / or B2), the hard member (B1) has the contact surface with the soft member (B2) at the center of the back surface layer (C). It is characterized by being inclined toward the surface, so it has excellent body pressure dispersion performance, has a high floor slip prevention effect, and has a high rigidity at the periphery of the mattress, but at the boundary between the center and the periphery of the mattress. Instability at the end sitting position due to the hardness gap To eliminate the physical burden associated with the up, rising ease of on the bed, moving ease, to be excellent in stability of Tanzania position was demonstrated.
Therefore, it can be used as a mattress with functionality for the purpose of supporting independence for moderate and mild care recipients as well as those who need assistance and the elderly. It can be preferably used as a special mattress for assisting the operation.

It is a cross-sectional schematic diagram explaining the layer structure of the mattress of this invention. It is a cross-sectional schematic diagram explaining the cross-sectional shape of the hard member (B1) of the intermediate | middle layer (B) which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foam mat material of surface layer (A) 2 Soft member (B2) of intermediate layer (B)
3 Hard member (B1) of intermediate layer (B)
4 Foam mat material for back layer (C)

Claims (9)

A mattress having a body pressure dispersion performance comprising at least three layers of a surface layer (A), an intermediate layer (B) and a back layer (C) formed by laminating foam mat materials,
The intermediate layer (B) has a structure in which a hard member (B1) is arranged on at least one of peripheral edges in the short side direction of the mattress, and a soft member (B2) is arranged in the center portion in the width direction of the mattress. While the hardness has a hardness relationship of (B1)>(C)> (A and / or B2), the hard member (B1) has the contact surface with the soft member (B2) as the center of the back surface layer (C). A mattress characterized by being inclined toward the head.   The hard member (B1) has a hardness measured in accordance with JIS K6401 “soft polyurethane foam for load bearing” of 250 to 440 N, and a cross-sectional inclination angle of the contact surface is 25 to 50 °. The mattress according to claim 1.   The surface layer (A) has a hardness of 70 to 130 N, the soft member (B2) has a hardness of 90 to 140 N, and a back surface layer (measured in accordance with JIS K6401 “Load Resistant Soft Polyurethane Foam”). The mattress according to claim 1 or 2, wherein the hardness of C) is 150 to 210N.   The thickness of the surface layer (A) is 15 to 30 mm, the thickness of the intermediate layer (B) is 25 to 40 mm, and the thickness of the back surface layer (C) is 35 to 45 mm. The mattress in any one of -3.   The hardness of the center part of the mattress measured in accordance with JIS K6401 “Load Resistant Soft Polyurethane Foam” is 85 to 95 N, and the hardness of the peripheral part of the mattress is 150 to 170 N. The mattress according to claim 1, wherein the mattress gradually increases with respect to the hardness.   The hard member (B1) is incorporated with a distance of 150 to 200 mm from the end of the mattress long side to the start position of the contact surface with the soft member (B2). A mattress according to any one of the above.   It has a some groove | channel in the short side direction of the outer side of a back surface layer (C) and / or the surface layer side of a hard member (B1), or a back surface layer side. mattress.   The mattress according to any one of claims 1 to 7, wherein the foamed mat material is polyurethane foam.   The mattress according to any one of claims 1 to 8, wherein a gel sheet is further laminated on at least one surface of the intermediate layer (B).

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